package cn.tedu._05weibo.interceptors;

import cn.tedu._05weibo.pojo.vo.UserVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

@Slf4j
public class LoginCheckInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        /*
         * 1.获取会话:HttpSession;  HttpSession session = request.getSession();
         * 2.校验登录状态:
         *   2.1 登录状态: return true; 放行;
         *   2.2 未登录状态:
         *       重定向到登录页面: response.sendRedirect("/login.html");
         *       return false;
         */
        log.debug("由Spring MVC拦截器进行登录状态的校验......");
        HttpSession session = request.getSession();
        UserVO userVO = (UserVO) session.getAttribute("user");
        // 未登录
        if (userVO == null){
            // 重定向到登录页面
            response.sendRedirect("/login.html");
            return false;
        }
        // 登录状态:放行
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        HandlerInterceptor.super.postHandle(request, response, handler, modelAndView);
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        HandlerInterceptor.super.afterCompletion(request, response, handler, ex);
    }
}
